[PATCH] Fix gnu-versioned-namespace build

[François Dumont]

I plan to commit this tomorrow.

Note that rather than just adding the missing 
_GLIBCXX_[BEGIN,END]_VERSION_NAMESPACE I also move anonymous namespace 
usage outside std namespace. Let me know if it was intentional.

 Â Â Â  * src/c++11/random.cc: Add _GLIBCXX_BEGIN_NAMESPACE_VERSION and
 Â Â Â  _GLIBCXX_END_NAMESPACE_VERSION. Move anonymous namespace outside std
 Â Â Â  namespace.

Tested under Linux x86_64 normal/debug/versioned namespace modes.

There are still tests failing in versioned namespace, more patches to come.

François

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